korean: 제 아들이 디자인한 골프공 로켓입니다. 꽤 안정적이죠. 처음에 로켓과학 분야를 접하면서 꽤나 흥미로운 실험이라고 생각했어요. 화살처럼 곧게 쭉 날아가니까요.
english: My son designed a rocket that became stable, a golf ball rocket -- I thought it was quite an interesting experiment in the principles of rocket science -- and it flies straight as an arrow.